Method and apparatus for classifying and processing SDAP control PDU in next generation mobile communication system

Abstract

Disclosed are a communication scheme and a system thereof for converging an IoT technology and a 5G communication system for supporting a high data transmission rate beyond that of a 4G system. The disclosure can be applied to intelligent services (for example, services related to a smart home, smart building, smart city, smart car, connected car, health care digital education, retail business, security, and safety) based on the 5G communication technology and the IoT-related technology. Disclosed are a method and an apparatus for supporting a multimedia telephony (MMTEL) system, a method and an apparatus for efficiently operating a new QoS layer (service data access protocol (SDAP)), and a method and an apparatus for efficiently supporting a bandwidth part in the SCell in carrier aggregation or in dual connectivity.

The invention claimed is: 
     
       1. A method of transmitting a signal by a transmitter in a wireless communication system, the method comprising:
 generating a service data access protocol (SDAP) control protocol data unit (PDU); 
 calculating a message authentication code-integrity (MAC-I), using the SDAP control PDU based on an integrity protection configuration; 
 generating a PDCP (packet data convergence protocol) PDU based on a PDCP header, the SDAP control PDU, and the MAC-I; and 
 delivering the PDCP PDU to a lower layer, 
 wherein the SDAP control PDU comprises a QoS flow ID (QFI) and indicates that a mapping relationship between a QoS flow indicated by the QFI and a data radio bearer (DRB) for transmitting the SDAP control PDU ends; and 
 wherein ciphering and header compression are not applied to the SDAP control PDU. 
 
     
     
       2. The method of  claim 1 , wherein the SDAP control PDU comprises information indicating a format of an SDAP PDU and the QFI, and has a size of 1 byte. 
     
     
       3. The method of  claim 1 , wherein the SDAP control PDU is generated when a configured mapping relationship between a QoS flow and a DRB is different from a stored mapping relationship between a QoS flow and a DRB. 
     
     
       4. A transmitter in a wireless communication system, the transmitter comprising:
 a transceiver; and 
 a controller coupled with the transceiver and configured to: 
 generating a service data access protocol (SDAP) control protocol data unit (PDU); 
 calculating a message authentication code-integrity (MAC-I), using the SDAP control PDU based on an integrity protection configuration; 
 generating a PDCP (packet data convergence protocol) PDU based on a PDCP header, the SDAP control PDU, and the MAC-I; and 
 delivering the PDCP PDU to a lower layer, 
 wherein the SDAP control PDU comprises a QoS flow ID (QFI) and indicates that a mapping relationship between a QoS flow indicated by the QFI and a data radio bearer (DRB) for transmitting the SDAP control PDU ends; and 
 wherein ciphering and header compression are not applied to the SDAP control PDU. 
 
     
     
       5. The transmitter of  claim 4 , wherein the SDAP control PDU comprises information indicating a format of an SDAP PDU and the QFI, and has a size of 1 byte. 
     
     
       6. The transmitter of  claim 4 , wherein the SDAP control PDU is generated when a configured mapping relationship between a QoS flow and a DRB is different from a stored mapping relationship between a QoS flow and a DRB.